Income Taxes - Schedule of Deferred Tax Assets and Liabilities (Detail) - USD ($) $ in Thousands	Dec. 31, 2024	Dec. 31, 2023
Deferred tax assets:
Tax basis of loans in excess of financial statement basis	$ 23,978	$ 21,546
Recognized for financial reporting purposes but not yet for tax purposes: Deferred compensation	3,993	3,525
Net unrealized loss on investment securities available-for-sale	112,786	107,206
Other deferred tax assets	1,024	727
Total deferred tax assets	141,781	133,004
Deferred tax liabilities:
Financial statement basis of fixed assets in excess of tax basis	8,655	7,164
Intangible asset amortization deductible for tax purposes, but not for financial reporting purposes	14,611	14,207
Recognized for financial reporting purposes but not yet for tax purposes - accretion on investment securities	1,220	718
Other deferred tax liabilities	296	115
Total deferred tax liabilities	24,782	22,204
Net deferred tax asset (liability)	$ 116,999	$ 110,800